The Fed running low on ammunition?

The Federal Reserve has certain assets — about $800 Billion in Treasuries. Once it lends away the additional $200 Billion announced today, and counting the TAFs (Term Auction Facilities), about one-half of the Fed’s reserve of Treasuries will be gone. This chart shows the Fed’s reserves before this additional $200 billion is given out, so you’ll have to continue that line downwards to imagine what it’ll look like by the end of March: